operator: reconcile kubernetesClusterVersion

operators/constellation-node-operator/internal/upgrade/upgrade.go

@@ -0,0 +1,61 @@
+/*
+Copyright (c) Edgeless Systems GmbH
+
+SPDX-License-Identifier: AGPL-3.0-only
+*/
+
+package upgrade
+
+import (
+	"context"
+	"fmt"
+	"net"
+
+	mainconstants "github.com/edgelesssys/constellation/v2/internal/constants"
+
+	"github.com/edgelesssys/constellation/v2/upgrade-agent/upgradeproto"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
+)
+
+// Client is a client for the upgrade agent.
+type Client struct {
+	dialer Dialer
+}
+
+// NewClient creates a new upgrade agent client.
+func NewClient() *Client {
+	return &Client{
+		dialer: &net.Dialer{},
+	}
+}
+
+// Upgrade upgrades the Constellation node to the given Kubernetes version.
+func (c *Client) Upgrade(ctx context.Context, KubeadmURL, KubeadmHash, WantedKubernetesVersion string) error {
+	conn, err := grpc.DialContext(ctx, mainconstants.UpgradeAgentMountPath, grpc.WithTransportCredentials(insecure.NewCredentials()),
+		grpc.WithContextDialer(
+			func(ctx context.Context, addr string) (net.Conn, error) {
+				return c.dialer.DialContext(ctx, "unix", addr)
+			},
+		))
+	if err != nil {
+		return fmt.Errorf("failed to dial: %w", err)
+	}
+	defer conn.Close()
+
+	protoClient := upgradeproto.NewUpdateClient(conn)
+	_, err = protoClient.ExecuteUpdate(ctx, &upgradeproto.ExecuteUpdateRequest{
+		KubeadmUrl:              KubeadmURL,
+		KubeadmHash:             KubeadmHash,
+		WantedKubernetesVersion: WantedKubernetesVersion,
+	})
+	if err != nil {
+		return fmt.Errorf("failed to execute update: %w", err)
+	}
+	return nil
+}
+
+// Dialer is a dialer for the upgrade agent.
+type Dialer interface {
+	DialContext(ctx context.Context, network string, address string) (net.Conn, error)
+}